利用真空的

例句：

1. 1.The vacuum cleaner is designed to suck updust and dirt.
   真空吸尘器设计用来吸走灰尘和污垢。
2. 2. The scientist used avacuum flask to collect the gas.
   科学家使用一个真空瓶来收集气体。
3. 3. The vacuumcleaner was used to clean the floor ofthe house.
   真空吸尘器被用来清洁房子的地板。